| 摘要 |
<p>The device has a wheel arm (10) integrated to a chassis (2) of a tractor by a support (11). A positioning system (3) has a stop (30) and a hydraulic jack (31) integrated to the support and chassis, respectively. The jack has a rod with a contact unit to exert a force on the stop to rotate the support around a shaft for bringing a top soiling wheel (1) towards a rear i.e. in a direction opposite to displacement direction of the tractor.</p> |
